Bulky and small-steric-hindrance ligand and use thereof

Abstract

Provided are a bulky and small-steric-hindrance ligand and use thereof, belonging to the field of chemical catalytic technology. It is a ligand for a catalytic system used in the selective oligomerization of ethylene, which produces 1-octene as the main product and 1-hexene and 1-butene as by-products. The ligand is a ternary catalytic system composed of a central metal chromium, a ligand, and an aluminum-containing activator. During the in-situ preparation process, the ligand can regulate the molecular self-assembly in the process of formation of catalytically active species. This achieves selective oligomerization of ethylene that exclusively produces three useful comonomers: 1-octene as the main product and 1-hexene and 1-butene as byproducts. The distribution of the three monomers is adjustable without generating any olefin waste. For polyolefin enterprises, only one set of oligomerization equipment using this catalyst needs to be constructed to meet the demand for the three different copolymerization monomers.

Dependencies are inferred from the claim text.